They were leaving the store with their groceries when the suspect grabbed a wallet from the woman’s hand and ran, Snell said.

The man chased after the suspect for about a block and a half but then suffered a medical problem and collapsed, Snell said. The man then needed immediate medical attention and was taken to a local hospital.

His injuries weren’t believed to be life-threatening.

At one point, a passerby joined the chase and struggled with the suspect as he climbed a fence but was unable to detain the man, Snell said.

Officers called out detectives and used a police dog to search the area, Snell said. They also were collecting evidence, including a shirt believed to have been lost by the robber while he tried to get away.

They don’t believe the suspect had a weapon.

The suspect was described as white, about 5-foot-9 and in his late teens.

Anyone with information should call 911, Everett police at 425-257-8450 or Crime Stoppers of Puget Sound at 1-800-222-TIPS.